Roaring Fork River below Maroon Creek near Aspen
Roaring Fork River · Rockies · USGS gage 09076300
Coldwater (summer mean 11.9°C — prime coldwater).
Water
50°F
Flow
353 cfs
Air
74°F
Sky
0%
Predicted hatches · 2026-06-15
PredictedMidgeChironomidae0.49
Predicted by conditions; no reports yet. water 10.1°C (50°F) is cooling past the prime band (1-10°C); shoulder of the season; 8 days sustained ≥0°C; watch midday, especially cold months.
flies: Zebra Midge #18-22, Griffith's Gnat, Disco Midge
PREDICTED from the first-principles model only. Report-confirmed signal (fly-shop & forum reports) is the next milestone.